Underscore.js _.isError() Function
Last Updated :
25 Nov, 2021
Underscore.js is a library in javascript that makes operations on arrays, string, objects much easier and handy. _.isError() function is used to check whether the given object is javascript Error Object or not.
Note: It is very necessary to link the underscore CDN before going and using underscore functions in the browser. When linking the underscore.js CDN The “_” is attached to the browser as a global variable.
Syntax:
_.isError(object);
Parameters: It takes only one parameter i.e object.
Returns: It returns the boolean value. If the object is a inherit from Error object of javascript it returns true otherwise false is returned by the function.
Few Examples are given below for a better understanding of the function.
Example 1: When error is created from error object
<!DOCTYPE html>
<html>
<head>
<script src =
</script>
</head>
<body>
<script>
let e=new Error()
let ans=_.isError(e)
console.log(_.isError(e))
if(ans)
console.log("It is the javascript error")
</script>
</body>
</html>
|
Output:
Example 2: When try catch is used to throw error.
<!DOCTYPE html>
<html>
<head>
<script src =
</script>
</head>
<body>
<script>
let e;
try{
alrt("GeeksforGeeks")
}
catch(e){
let ans=_.isError(e)
console.log(`Error is ${e}`)
console.log(_.isError(e))
if(ans)
console.log("It is the javascript error object")
}
</script>
</body>
</html>
|
Output:
Example 3: When given error is string type.
<!DOCTYPE html>
<html>
<head>
<script src =
</script>
</head>
<body>
<script>
let e="some error"
let ans=_.isError(e)
console.log(_.isError(e))
if(ans)
console.log("It is the javascript error object")
else
console.log("It is not the javascript error object")
</script>
</body>
</html>
|
Output:
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